Thread: Guyyzz,the output is not coming-- PLS HELP

the program is for generating prime numbers. The input would be how many prime number a user wants from the code.

-----------------------------------------------------------------------------------------------------------------

import java.util.*;
public class primeNUMBERS {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner input=new Scanner(System.in);
System.out.println("Enetr the nos of prime numbers");
int number=input.nextInt();
System.out.println("The prime numbers are:");
primenumbers(number);

}

public static void primenumbers(int nos){
int firstnumber=2;
int count=0;
while(count<nos){
for(int divisor=2;divisor<firstnumber/2;divisor++){
if(firstnumber%divisor!=0)
System.out.println("\t"+firstnumber);
firstnumber++;
}
count++;
}
}
}

Check your for loop's conditions. Analyse when is it true and when is it false.

It is way too confusing. Make a separate method to check if a given number is prime and in your method return all prime numbers nos and lower.

public boolean isPrime(int x){
  for(int z = 2; z < x/2; z++){
    if(x%z == 0){
      return true;
    }
  }
return false;
}
 
public void primeNumbers(int x){
  for(int z = 0; z <= x; z++){
    if(isPrime(z){
      System.out.println(z);
    }
  }
}

No. Check _manually_ whether you've provided _correct_ "while" condition at for-loop.

why we cant write "return false" in for loop itself after "else" statement????

By the way, that loop is incorrect. It checks whether a number is not prime. If we write "return" in a loop, will that loop be still correct in all cases?

Then it should give the output of that nos. which are not prime numbers. But the output is not coming only, I think the method is not running. Wat to do, pls help!!

Originally Posted by Ashish S

Then it should give the output of that nos. which are not prime numbers. But the output is not coming only, I think the method is not running. Wat to do, pls help!!

What does this even mean?

If you still have a question, post the current version of the code with the question.
Please use complete sentences and full words in your posts.